Mercer & Barker MB5G Trombone BSP; model "Raptor"; mouthpiece for Tenor Trombone; cup: 25.40mm; rim: 6.85mm; throat: 7.40mm; dimensionally based on the Bach 5G this mouthpiece gives you the comfort of the mouthpiece unique rim that reduces lip fatigue but will shape to offer clear articulation and easily centre notes giving you that Zip when needed; the slightly heavier weight enhances the sound making it a great allround favourite for the trombone specialist; large shank; silver plated, polished to a mirror finish